DeltaPunch:One of the funnest things I've recently read is Wiki on the accuracy of the numbers and figures quoted in the original Galaxy Song:

Eric Idle sings that the Earth is "revolving at nine hundred miles an hour"; the actual figure (at the equator) is 1,038. He gives the Earth's orbital speed as 19 miles (31 km) per second, compared with the real figure of 18 to 18.5.